100 grams of oil-heated to 80°C are added to 200 grams of water at 20°C. Then the resulting temperature would be 55.48°C.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
As given in the problem 100 grams of oil (specific heat capacity 2200 J/kg °C) heated to 80°C is added to 200 grams of water (specific heat capacity 4200 J/kg °C) at 20°C
mCΔT for oil =mCΔT for water
100×2200×(80-T) = 200× 4200×(T-20)
1760-22T = 84 T -1680
62T = 1760+1680
T = 55.48°C
Thus, the resulting temperature of the mixture would be 55.48°C.
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An atom is most balanced when it has an equal number of protons and electrons. True False
Answer: It is true.
Explanation: In all atoms, the number of electrons and protons is always equal. This preserves the atom's electrical neutrality by balancing positive and negative charges. If the amount of electrons and protons in an atom is not equal, the atom will have a net positive or negative charge, forming a cation or an anion.
A weight is suspended motionless from a bar which hangs from the ceiling by two ropes. The
weight has 25 N of gravitational force pulling on it. A free-body diagram for this situation looks
like this:
Answer: a weight of 25n
Explanation:4+5
which statement would need to be true for astrology to be considered a science?
A. Experimental evidence is collected that supports that astrology is to be considered a science.
Which statement best describes that the astrology is the part of science?Through experiments and researches, we can collect a lot of evidences about the relationship between science and astrology. If the evidences are in favour of astrology so we can say that astrology is to be considered as science. The invention of the astrology was made in Babylon far back in antiquity. An astrology is not considered to be the part of the science, because there is no evidence present in the history that the astrology is the part of the science. But the main thing is that the astrology contains the logics, and logics is present in the science. So there is a very small relation between the astrology and the science.
So we can conclude that Experimental evidence is collected that supports it is the correct statement.
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A. Experimental evidence is collected that supports it.
B. The majority of people believe that its claims are true.
C. Its explanations are supported by a scientific law.
d. Government funding is used to support it.
Applying a constant net force to an object causes it to accelerate at 0=9.0 m/s2.
What will the acceleration 3 of the object be if the force is doubled and the mass is doubled?
The acceleration of the object be if the force is doubled and the mass is doubled is equal to 9m/s².
let the initial mass of the object be m₁.
given:
initial acceleration (a₁) = 9m/s²
initial constant force (F₁) = constant (k)
therefore,
F₁= m₁×a₁ ------------------------------- equation 1
now,
according to the the question the force is doubled
i.e.
new force (F) = 2×F₁
and the mass too is doubled,
i.e.
new mass of the object(m)=2×m₁
new equation for force and acceleration:
F= m ×a
2F=2m₁×a --------------------------equation 2
dividing equation 2 by equation 1
we get,
[tex]\frac{2F}{F}=\frac{2m₁×a}{m₁×a₁ }[/tex]
a = a₁
a=9m/s²
the acceleration of the object be if the force is doubled and the mass is doubled is equal to 9m/s².
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A book is at rest on a table top. The gravitational force acting on it is 100 N. A free-body
diagram for this situation looks like this:
Answer: 100n
Explanation: 1+1=2
On an electrolytic or paper capacitor, what does the black band indicate?
A. That the capacitor's negative lead is near the band
B. That the capacitor's voltage rating is less than 100 VDC
C. That the capacitor is color-coded to military specifications
D. That the capacitor has a value less than 10 mF
C. On an electrolytic or paper capacitor, the black band indicate that the capacitor is color-coded to military specifications.
What is paper capacitor?Paper Capacitor is a fixed capacitor in which flat thin strips of metal foil, usually aluminium is separated by dielectric material paper.
Paper capacitor is used in electronic noise filtering, signal coupling and decoupling systems, and remote sensing systems.
What does the black band indicate in paper capacitor?The coloured bands represent the capacitance value as per the colour code. That is the capacitor is color-coded to specifications.
The black band usually indicate the specification of the capacitor.
Thus, on an electrolytic or paper capacitor, the black band indicate that the capacitor is color-coded to military specifications.
So the correct option is C.
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scoliosis is a common disease of the spine where the spine is not straight but forma an S or C shape while viewing a patients from the front
The correct answer is Scoliosis is a spine curvature that occurs most frequently in adolescents.
Scoliosis is a spine curvature that occurs most frequently in adolescents.The most commonly used brace is made of plastic and contoured to fit the body. Because it fits under the arms and around the rib cage, lower back, and hips, this brace is almost invisible under clothing.
The majority of braces are worn between 13 and 16 hours per day. Idiopathic, congenital, and neuromuscular conditions The most common type of scoliosis is idiopathic. This means that the cause is unknown or that no single factor contributes to the disease's development.Scoliosis can improve with treatment, but it is not always a sign of something serious, and it is not always necessary if it is mild.
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An 80% furnace's discharge air temperature is 125 degrees F and is adding heat to a space at the rate of 80,000 BTU's an hour. What is the input rating of the furnace?
a. 60,000 Btu's
b. 120,000 Btu's
c. 75,000 Btu's
d. 100,000 Btu’s
D. The input rating of the furnace is determined as 100,000 BTU.
What is input rating?Input power rating means the power, expressed in Watts or one of its multiples, for which the energy storage unit has been designed to operate at nominal conditions.
eff = (output rating / input rating) x 100%
80/100 = 80,000 BTU / input rating
0.8 = 80,000 BTU / input rating
input rating = 80,000 BTU/0.8
input rating = 100,000 BTU
Thus, the input rating of the furnace is determined as 100,000 BTU.
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Is the suns gravitational pull on the earth the same at all seasosons of the year
No, the sun's gravitational pull is not same at all seasons of the year
The gravitational force between the Sun and Earth depends on the earth's distance from the sun and hence it varies over the course of a year. This is because the Earth’s orbit is an ellipse, bulged at the poles like an orange rather than a perfect circle. Earth’s average distance from the sun is approximately 150 million km , closest distance to the Sun is 146 million km, the largest distance is about is 152, so the distance varies by about 5.
The gravitational force between two bodies depends on their mass (how heavy they are) and their distance, and the distance changes according to the rotation an d revolution of the earth around the sun so the gravitational force also varies.
Earth revolves around the sun in its elliptical orbit and hence the force is balanced out due to certain factors and does not spiral out from its orbit. The change in gravitational force is balanced out due to certain factors such as change in speed of rotation and more and hence the gravitational pull on the earth is not the same .
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True or false - The vector for a negative acceleration points in the opposite direction when
compared to the vector for a positive acceleration.
Explanation:
the ratio between two circles vqjoizxcvu g çm
The driver of a car slams on the brakes, causing the car to slow down at a rate of 17.0ft/s2 as the car skids 172ft to a stop
How long does the car take to stop?
What was the car's initial speed?
The time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.
Initial speed of the carThe initial speed of the car is calculated as follows;
v² = u² + 2as
where;
v is the final velocity, when the car stops, v = 0u is the initial velocitya is the accelerations is the distance traveled0 = u² + 2as
0 = u² + 2(-17)(172)
0 = u² - 5858
u² = 5848
u = 76.47 ft/s
Time of motion of the carv = u + at
0 = 76.47 - 17t
17t = 76.47
t = 4.5 seconds
Thus, the time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.
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what type of force os your answer in number 4?
The electromagnetic force, the weak nuclear force, the strong nuclear force, and gravity.
The strong force, weak force, electromagnetic force, and gravitational force are the four fundamental forces operating in the universe. They each operate within different parameters and have unique strengths. Although gravity has an infinite range, it is the weakest force. Although it has an infinite range, the electromagnetic force is much stronger than gravity. The weak and strong forces are dominant only at the level of subatomic particles and are only effective over very small distances. Even though it has a weaker name than gravity, the weak force is actually the weakest of the three. The strongest of the four fundamental interactions is the strong force, as its name suggests.
Actually, out of the four fundamental forces, gravity is the weakest. The four forces are the electromagnetic force, gravity, the weak nuclear force, and the strong nuclear force, in that order.
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One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 2.97 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the couple’s displacement? (c) What is the direction (relative to due east) of the couple’s displacement?
The distance they travel is 4.85 km. the magnitude of the couple’s displacement is 1.456 km. The displacement vector is 315 degrees counterclockwise in relation to the east.
The total distance traveled is the overall distance traveled during the entire excursion. However, the displacement is the net distance traveled between the starting location and the final position. Displacement cannot exceed distance in any way. An element of a vector is the displacement. It is a scalar quantity, the distance.
The couple circles a circular lake on foot about 3/4 of the way.
The circle has a radius of r = 1.03 km, or 1030 meters.
The couple's journey begins at point A and ends at point D by taking the path ABCD.
The journey's distance is calculated as follows:
d = 0.75*2*3.14*1.03*d
=4.85 km
The net distance between points A and D is the displacement's magnitude. |d| = |AD|=|r2+r2
= 21.03/2
=1.456 km
The displacement vector is 315 degrees counterclockwise in relation to the east.
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A ruler is knocked off the end of a desk with a horizontal velocity of 1.2ms-1. If the desktop is 0.8m above the floor then calculate:
a) the resultant velocity of the ruler when it hits the floor?
b) the horizontal displacement of the ruler?
If a ruler is knocked off the end of a desk with a horizontal velocity of 1.2ms-1. If the desktop is 0.8m above the floor then the resultant velocity of the ruler would be 4.13 meters/seconds.
What is a projectile motion?It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
The final velocity of the ruler can be calculated with the help of the third equation of motion in the vertical direction under the influence of gravity,
v² - u² = 2as
v = √(2gh)
=√2*9.81*0.8
= 3.96 m/s
The resultant velocity of the ruler = √(3.96² + 1.2²)
=4.13 meters / seconds
Time is taken to hit the ground = 3.96 / 9.81
=0.4036 seconds
The horizontal displacement of the ruler = 1.2*0.4036
=0.48432 meters
Thus, the resultant velocity of the ruler would be 4.13 meters/seconds.
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What is the average velocity of the object?
______ m/s
Answer:
0.1 m/s (or 100 cm/s)
Explanation:
At the first point on the graph’s faded grid, the object has traveled 1 meter in 10 seconds. At the next point, the object traveled 2 meters in 20 seconds. This is a 1 to 10 ratio, or 1/10, which is 0.1 in decimal format.
Which combination of atoms form covalent bonds?
nonmetals & metals
metals only
nonmetals only
none of these
Previous
What is the largest structure people have put into space?
Hubble Space Telescope
International Space Station
Space Shuttle
Mars rover Curiosity
Answer:
International Space Station
Explanation:
I did the test and I’m 100% sure
Answer:
b) International Space Station
Explanation:
International Space Station (ISS) is the largest structure, which people have put into space. Hence, option (b) is correct.
2. How long will it take for a bicycle to travel across from point A to
point D as shown below in the figure if his velocity was 4 m/s. Hint: use
Pythagorean Theorem () to find your displacement. A²+ B² = (²
A
25m
B
25m
D
35m
C
V = & Devt T=B
Answer:
I guess equal to ABD
Can you give me the reference frame for every one of these please.
The sun rises over the horizon.
A bus moves past people standing on the sidewalk.
A passenger on that same bus sees a ball roll down the aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed.
A passenger in that airplane looks down and sees the train moving backward.
A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down.
A bus moves past people standing on the sidewalk, reference frame is people on the sidewalk.A passenger on that same bus sees a ball roll down the aisle, reference frame is the train aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform, reference frame is the station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still, reference frame is the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed, reference frame is railroad track.A passenger in that airplane looks down and sees the train moving backward, reference frame is inside of the airplane.A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down, reference frame is the aisle.
What is reference frame?
Reference frame can be described as the stationary background to which an object is compared to tell if it is moving.
A frame of reference is therefore a purely kinematical device, for the geometrical description of motion without regard to the masses or forces causing the motion.
The instance we discussed had different reference frames all of which are the stationary background of the objects.
In conclusion, reference frame of an object describes the motion without regard to the forces causing the motion.
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A string applies an upward (tension) force of 34 N to lift a bucket of mass 2.8 kg. What is
the acceleration of the bucket? (Answer in m/s²)
The acceleration of the bucket of mass 2.8 kg which is lifted upwards with a force of 34 N is 12.14 m / s²
According to Newton's second law of motion,
F = m a
F = Force
m = Mass
a = Acceleration
F = 34 N
m = 2.8 kg
a = F / m
a = 34 / 2.8
a = 12.14 m / s²
Acceleration is the rate of change of velocity of an object with respect to time. It is denoted as a.
Therefore, the acceleration of the bucket is 12.14 m / s²
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What was Einstein Seeking?
Einstein was seeking a way to unify electromagnetism and gravity into a single theory.
After all the breakthroughs given by Einstein, he then worked on a " Grand Unified theory" for the last thirty of his life. He believed that all the forces of nature ( Electromagnetism and gravity were the only forces discovered at that time ) must be described by a single theory.
He failed to figure out a way to unify the forces of nature under a single theory. But physicists, even to this day are still working on the Grand Unified theory.
Therefore, Einstein was seeking a way to unify electromagnetism and gravity into a single theory.
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The more exercise a person takes the fewer medical problems they report. This is an example of:
O A. statistical independence.
B. a positive correlation.
O C. a negative correlation.
D. a curvilinear relationship
Answer:
The best answer seems to be B because there is a strong positive correlation that the more exercise a person does, the fewer medical problems they have
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!
The more exercise a person takes the fewer medical problems they report. This is an example of a positive correlation. The correct option is B.
What is positive correlation?When two variables rise or decrease simultaneously, there is a positive correlation; when there is a negative correlation, one variable increases as the other falls.
When two variables behave in unison, rising or falling in lockstep with one another, there is a positive correlation.
When two variables move in opposition to one another—that is, when one rises, the other falls—this is known as a negative correlation.
A person reports fewer medical issues the more activity they get. An illustration of a positive correlation would be this.
Thus, the correct option is B.
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A rectangular box is h = 8.5 inches in height, w = 36.5 cm wide, and L = 0.55 yards long.
Please help!!!
The volume of the rectangular box is 39559.36 cm³.
What is volume?Volume can be defined as the capacity of a solid substance. The S.I unit of volume is m³.
To calculate the volume of the rectangular box, we use the formula below.
Formula:
V = lwh................... Equation 1Where:
V = Volume of the rectangular boxl = Length of the boxw = Width of the boxh = Height of the boxFrom the question,
Given:
l = 0.55 yards = 50.2 cmw = 36.5 cmh = 8.5 inches = 21.59 cmSubstitute these values into equation 1
V = (50.2×36.5×21.59)V = 39559.36 cm³Hence, the volume of the rectangular box is 39559.36 cm³.
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Which of these objects could be falling with constant acceleration?
Object 1 and Object 2 will have a constant acceleration.
We know the expression for Displacement, Acceleration, and Time can be represented by the equation: S = ut + 1/2at². We will compare cases for each object at a given position and time and check if the object maintains a constant acceleration.
=> S = ut +1/2at², where S = Displacement/position of object, u = Initial velocity, t = time, a = acceleration.
For Object 1,
Case 1 : 0.44 = 0*0.3 + 1/2*a*(0.3)²
a = 9.78
Case 2 : 3.14 = 0*0.08 + 1/2*a*(0.8)²
a = 9.81
Acceleration is approximately constant for object 1.
For Object 2:
Case 1 : 0.06 = (0) (0.3) + ½ a (0.3)²
a = 1.33
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration is approximately constant for object 2.
For Object 3:
Case 1 : 0.44 = (0) (0.3) + ½ a (0.3)²
a = 9.78
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration has a lot of differences in both cases of Object 3 so it's not constant.
Hence, Object 1 and Object 2 have constant acceleration.
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In a longitudinal wave, the medium moves
left to right
up and down
in circles
In a longitudinal wave, the particles of the medium have to and fro motion about their mean motion, along the direction of wave motion.
Longitudinal waves are waves in which the displacement of the medium is in the same (or the opposite) direction as the wave propagation and the medium vibration is parallel ("along") to the direction the wave travels. Because they create compression and rarefaction when passing through a material, mechanical longitudinal waves are also known as compressional or compression waves. A nice illustration is a wave down the length of a stretched Slinky toy, where the space between the coils grows and shrinks. Examples from the real world include seismic P-waves and sound waves (which are oscillations in pressure, a particle's displacement, and a particle's velocity) (created by earthquakes and explosions).
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Please help with this problem!
The horizontal displacement of the backpack as it falls is 765 m.
Data obtained from the questionFrom the question given above, the following data were obtained:
Initial velocity (u) = 85 m/sAcceleration due to gravity (g) = 9.8 m/s²Time (t) = 9 sHorizontal displacement (s) =?How to determine the horizontaal displacementThe horizontal displacement of the backpack can be obtained as follow:
s = ut
s = 85 × 9
Horizontal displacement = 765 m
From the calculation made above, we can see that the horizontal displacement (i.e distance from the car) were the backpack will land is 765 m. Thus, the backpack will not land on your car. Hence, you do not need to move the car.
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Do the following calculation and express the final answer in
proper scientific notation with the correct number of
significant digits:
(2.3 × 10^-3)(5.880 × 10^4) + 8.44
Answer:
x 10
I did the calculations and got 143.68. Since there’s multiplication I thought the number of sig figs would be 2 since 2.3 x 10^-3 has 2 sig figs. And I rounded the output to 14 and input 1.4 x 10^1 as the answer but got it wrong.
Answer:
Explanation:
I got the same thing. So, i don't know but good luck
On a day when the wind is blowing toward the south at 3 m/s, a runner jogs west at 4 m/s. What is the speed of the
air relative to the runner?
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here we go ~
[tex]{\sf {V}_{w} } [/tex]= velocity of wind = 3 m/s (south) [tex]{\sf {V}_{r} } [/tex]= velocity of runner = 4 m/s (west)So,
[tex]{\sf {V}_{w} } [/tex] = - 3 [tex]{ \sf \hat{j}} [/tex][ taking unit vector along north be [tex]{ \sf \hat{j}} [/tex] ]
[tex]{\sf {V}_{r} } [/tex] = - 4 [tex]{ \sf \hat{i}} [/tex][ taking unit vector along west be [tex]{ \sf \hat{i}} [/tex] ]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= V_{w} - V_{r }[/tex]
[ where [tex]{ \sf V_{wr}= } [/tex] Relative velocity of wind with respect to runner ]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= - 3 \hat{ j} - ( - 4 \hat{i})[/tex]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= - 3 \hat{ j} + 4 \hat{i}[/tex]
That is : 3 m/s towards south and 4 m/s towards east.
So, it makes an angle of 37° with south, and 53° with East.
[ The resultant is depicted by yellow arrow in attachment ]
Magnitude :[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{3 {}^{2} + 4 {}^{2} }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{9 + 16 }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{25 }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = 5 \: \: m/s[/tex]
Direction :[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{b\: \sin \theta}{b + a \sin( \theta) } [/tex]
[tex]{\sf \theta }[/tex] = angle between the two vectors ( along east and south) i.e 90°
b = 4 units[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4\: \sin (90 \degree)}{3+ 4 \cos( 90 \degree) } [/tex]
[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4 \times 1}{3+( 4 \times 0)} [/tex]
[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4}{3} [/tex]
[tex] \dashrightarrow \sf \alpha = \tan {}^{ - 1} \bigg( \dfrac{4}{3 } \bigg)[/tex]
[tex] \dashrightarrow \sf \alpha = 53 \degree[/tex]
So, it's direction is 53° east from south ~
If Sandy moves rightward 10 meters, what is true about her displacement?
Her displacement is zero.
O Her displacement is positive.
Her displacement negative.
Which of the following branches studies the particles moving at any speed,
including very high speeds.
A. Optics
B. Thermodynamics
C. Astrophysics and Cosmology
D. Relativity
The correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity
Difference between Kinematic and Dynamics
Kinematic is a branch of Physics that deal with a study of particle's motion without considering the cause of the motion. While dynamics deals with the motion of a particle as well as the causes of the motion.
The branch of Physics that study the particles movement at any speed,
including very high speeds is Relativity.
We have relativity of mass, relativity of time and relativity of length. All deal with the speed of light which is the fastest speed on earth as of now.
Therefore, the correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity.
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